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thr_lock.h
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/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ /* For use with thr_lock:s */ #ifndef _thr_lock_h #define _thr_lock_h #ifdef __cplusplus extern "C" { #endif #include <my_pthread.h> #include <my_list.h> struct st_thr_lock; extern ulong locks_immediate,locks_waited ; /* Important: if a new lock type is added, a matching lock description must be added to sql_test.cc's lock_descriptions array. */ enum thr_lock_type { TL_IGNORE=-1, TL_UNLOCK, /* UNLOCK ANY LOCK */ /* Parser only! At open_tables() becomes TL_READ or TL_READ_NO_INSERT depending on the binary log format (SBR/RBR) and on the table category (log table). Used for tables that are read by statements which modify tables. */ TL_READ_DEFAULT, TL_READ, /* Read lock */ TL_READ_WITH_SHARED_LOCKS, /* High prior. than TL_WRITE. Allow concurrent insert */ TL_READ_HIGH_PRIORITY, /* READ, Don't allow concurrent insert */ TL_READ_NO_INSERT, /* Write lock, but allow other threads to read / write. Used by BDB tables in MySQL to mark that someone is reading/writing to the table. */ TL_WRITE_ALLOW_WRITE, /* WRITE lock used by concurrent insert. Will allow READ, if one could use concurrent insert on table. */ TL_WRITE_CONCURRENT_INSERT, /* Write used by INSERT DELAYED. Allows READ locks */ TL_WRITE_DELAYED, /* parser only! Late bound low_priority flag. At open_tables() becomes thd->update_lock_default. */ TL_WRITE_DEFAULT, /* WRITE lock that has lower priority than TL_READ */ TL_WRITE_LOW_PRIORITY, /* Normal WRITE lock */ TL_WRITE, /* Abort new lock request with an error */ TL_WRITE_ONLY}; enum enum_thr_lock_result { THR_LOCK_SUCCESS= 0, THR_LOCK_ABORTED= 1, THR_LOCK_WAIT_TIMEOUT= 2, THR_LOCK_DEADLOCK= 3 }; /* Priority for locks */ #define THR_LOCK_LATE_PRIV 1 /* For locks to be merged with org lock */ #define THR_LOCK_MERGE_PRIV 2 /* For merge tables */ #define THR_UNLOCK_UPDATE_STATUS 1 extern ulong max_write_lock_count; extern my_bool thr_lock_inited; extern enum thr_lock_type thr_upgraded_concurrent_insert_lock; /* A description of the thread which owns the lock. The address of an instance of this structure is used to uniquely identify the thread. */ typedef struct st_thr_lock_info { pthread_t thread; my_thread_id thread_id; void *mysql_thd; // THD pointer } THR_LOCK_INFO; typedef struct st_thr_lock_data { THR_LOCK_INFO *owner; struct st_thr_lock_data *next,**prev; struct st_thr_lock *lock; mysql_cond_t *cond; void *status_param; /* Param to status functions */ void *debug_print_param; /* For error messages */ struct PSI_table *m_psi; enum thr_lock_type type; enum thr_lock_type org_type; /* Cache for MariaDB */ uint priority; } THR_LOCK_DATA; struct st_lock_list { THR_LOCK_DATA *data,**last; }; typedef struct st_thr_lock { LIST list; mysql_mutex_t mutex; struct st_lock_list read_wait; struct st_lock_list read; struct st_lock_list write_wait; struct st_lock_list write; /* write_lock_count is incremented for write locks and reset on read locks */ ulong write_lock_count; uint read_no_write_count; void (*get_status)(void*, my_bool); /* When one gets a lock */ void (*copy_status)(void*,void*); void (*update_status)(void*); /* Before release of write */ void (*restore_status)(void*); /* Before release of read */ my_bool (*start_trans)(void*); /* When all locks are taken */ my_bool (*check_status)(void *); void (*fix_status)(void *, void *);/* For thr_merge_locks() */ const char *name; /* Used for error reporting */ my_bool allow_multiple_concurrent_insert; } THR_LOCK; extern LIST *thr_lock_thread_list; extern mysql_mutex_t THR_LOCK_lock; my_bool init_thr_lock(void); /* Must be called once/thread */ void thr_lock_info_init(THR_LOCK_INFO *info); void thr_lock_init(THR_LOCK *lock); void thr_lock_delete(THR_LOCK *lock); void thr_lock_data_init(THR_LOCK *lock,THR_LOCK_DATA *data, void *status_param); void thr_unlock(THR_LOCK_DATA *data, uint unlock_flags); enum enum_thr_lock_result thr_multi_lock(THR_LOCK_DATA **data, uint count, THR_LOCK_INFO *owner, ulong lock_wait_timeout); void thr_multi_unlock(THR_LOCK_DATA **data,uint count, uint unlock_flags); void thr_merge_locks(THR_LOCK_DATA **data, uint org_count, uint new_count); void thr_abort_locks(THR_LOCK *lock, my_bool upgrade_lock); my_bool thr_abort_locks_for_thread(THR_LOCK *lock, my_thread_id thread); void thr_print_locks(void); /* For debugging */ my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data, enum thr_lock_type new_lock_type, ulong lock_wait_timeout); void thr_downgrade_write_lock(THR_LOCK_DATA *data, enum thr_lock_type new_lock_type); my_bool thr_reschedule_write_lock(THR_LOCK_DATA *data, ulong lock_wait_timeout); void thr_set_lock_wait_callback(void (*before_wait)(void), void (*after_wait)(void)); #ifdef WITH_WSREP typedef my_bool (* wsrep_thd_is_brute_force_fun)(void *, my_bool); typedef int (* wsrep_abort_thd_fun)(void *, void *, my_bool); typedef int (* wsrep_on_fun)(void *); void wsrep_thr_lock_init( wsrep_thd_is_brute_force_fun bf_fun, wsrep_abort_thd_fun abort_fun, my_bool debug, my_bool convert_LOCK_to_trx, wsrep_on_fun on_fun); #endif #ifdef __cplusplus } #endif #endif /* _thr_lock_h */